$ git clone -n https://src.fedoraproject.org/rpms/rust-tap.git /var/lib/mock/f45-build-45311-822/root/chroot_tmpdir/scmroot/rust-tap
Cloning into '/var/lib/mock/f45-build-45311-822/root/chroot_tmpdir/scmroot/rust-tap'...
$ git fetch origin 85b64b5cb57e2f71bc377ed2d87a1f42ff5a07db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tap
 * [new ref]         85b64b5cb57e2f71bc377ed2d87a1f42ff5a07db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85b64b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild